OAR 918-225-0380: Exemptions for Refrigeration Chillers

(1) Waterside vessels of refrigeration chillers are exempt under ORS 480.510 to 480.665 if: (a) The design pressure does not exceed 300 pounds per square inch gauge, the temperature does not exceed 210°F., and the system includes an ASME-approved relieving device set at a maximum working pressure of 300 pounds per square inch gauge at 210°F; (b) The refrigerant side is built in accordance with the minimum safety standards and equipped with an ASME-approved relieving device set at or below the maximum working pressure and temperature as specified on the nameplate for the vessel; and (c) All installations of refrigeration chillers comply with ORS 480.630. (2) Systems connected to an outside heat energy source shall not be exempt from ORS 480.510 to 480.665. (3) If any of the limitations in section (1) of this rule are exceeded, the chiller must comply with the minimum safety standards. (4) This exemption does not apply to systems using ammonia as a refrigerant. [Publications: Publications referenced are available from the agency.]